Commit | Line | Data |
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1534c382 | 1 | /* |
75014550 | 2 | * Copyright IBM Corp. 2006, 2012 |
1534c382 MS |
3 | * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> |
4 | * Martin Schwidefsky <schwidefsky@de.ibm.com> | |
5 | * Ralph Wuerthner <rwuerthn@de.ibm.com> | |
cb17a636 | 6 | * Felix Beck <felix.beck@de.ibm.com> |
6bed05bc | 7 | * Holger Dengler <hd@linux.vnet.ibm.com> |
1534c382 MS |
8 | * |
9 | * Adjunct processor bus. | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2, or (at your option) | |
14 | * any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
24 | */ | |
25 | ||
136f7a1c MS |
26 | #define KMSG_COMPONENT "ap" |
27 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
28 | ||
62d146ff | 29 | #include <linux/kernel_stat.h> |
1534c382 MS |
30 | #include <linux/module.h> |
31 | #include <linux/init.h> | |
32 | #include <linux/delay.h> | |
33 | #include <linux/err.h> | |
34 | #include <linux/interrupt.h> | |
35 | #include <linux/workqueue.h> | |
5a0e3ad6 | 36 | #include <linux/slab.h> |
1534c382 MS |
37 | #include <linux/notifier.h> |
38 | #include <linux/kthread.h> | |
39 | #include <linux/mutex.h> | |
83e9d5d2 | 40 | #include <linux/suspend.h> |
85eca850 | 41 | #include <asm/reset.h> |
cb17a636 | 42 | #include <asm/airq.h> |
60063497 | 43 | #include <linux/atomic.h> |
cb17a636 | 44 | #include <asm/isc.h> |
fe137230 FB |
45 | #include <linux/hrtimer.h> |
46 | #include <linux/ktime.h> | |
a0616cde | 47 | #include <asm/facility.h> |
5d26a105 | 48 | #include <linux/crypto.h> |
1534c382 MS |
49 | |
50 | #include "ap_bus.h" | |
51 | ||
1749a81d | 52 | /* |
1534c382 MS |
53 | * Module description. |
54 | */ | |
55 | MODULE_AUTHOR("IBM Corporation"); | |
75014550 HD |
56 | MODULE_DESCRIPTION("Adjunct Processor Bus driver, " \ |
57 | "Copyright IBM Corp. 2006, 2012"); | |
1534c382 | 58 | MODULE_LICENSE("GPL"); |
5d26a105 | 59 | MODULE_ALIAS_CRYPTO("z90crypt"); |
1534c382 | 60 | |
1749a81d | 61 | /* |
1534c382 MS |
62 | * Module parameter |
63 | */ | |
64 | int ap_domain_index = -1; /* Adjunct Processor Domain Index */ | |
c1a42f49 | 65 | module_param_named(domain, ap_domain_index, int, S_IRUSR|S_IRGRP); |
1534c382 MS |
66 | MODULE_PARM_DESC(domain, "domain index for ap devices"); |
67 | EXPORT_SYMBOL(ap_domain_index); | |
68 | ||
b90b34c6 | 69 | static int ap_thread_flag = 0; |
c1a42f49 | 70 | module_param_named(poll_thread, ap_thread_flag, int, S_IRUSR|S_IRGRP); |
b90b34c6 | 71 | MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off)."); |
1534c382 MS |
72 | |
73 | static struct device *ap_root_device = NULL; | |
75014550 | 74 | static struct ap_config_info *ap_configuration; |
43c207e6 | 75 | static DEFINE_SPINLOCK(ap_device_list_lock); |
cf352ce0 | 76 | static LIST_HEAD(ap_device_list); |
1534c382 | 77 | |
1749a81d | 78 | /* |
8139b89d | 79 | * Workqueue timer for bus rescan. |
1534c382 | 80 | */ |
1534c382 MS |
81 | static struct timer_list ap_config_timer; |
82 | static int ap_config_time = AP_CONFIG_TIME; | |
3f3007af | 83 | static void ap_scan_bus(struct work_struct *); |
8139b89d | 84 | static DECLARE_WORK(ap_scan_work, ap_scan_bus); |
1534c382 | 85 | |
1749a81d | 86 | /* |
cb17a636 | 87 | * Tasklet & timer for AP request polling and interrupts |
1534c382 | 88 | */ |
3f3007af MS |
89 | static void ap_tasklet_fn(unsigned long); |
90 | static DECLARE_TASKLET(ap_tasklet, ap_tasklet_fn, 0); | |
1534c382 MS |
91 | static atomic_t ap_poll_requests = ATOMIC_INIT(0); |
92 | static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait); | |
93 | static struct task_struct *ap_poll_kthread = NULL; | |
94 | static DEFINE_MUTEX(ap_poll_thread_mutex); | |
93521314 | 95 | static DEFINE_SPINLOCK(ap_poll_timer_lock); |
fe137230 FB |
96 | static struct hrtimer ap_poll_timer; |
97 | /* In LPAR poll with 4kHz frequency. Poll every 250000 nanoseconds. | |
98 | * If z/VM change to 1500000 nanoseconds to adjust to z/VM polling.*/ | |
99 | static unsigned long long poll_timeout = 250000; | |
1534c382 | 100 | |
772f5472 FB |
101 | /* Suspend flag */ |
102 | static int ap_suspend_flag; | |
889875a1 MS |
103 | /* Maximum domain id */ |
104 | static int ap_max_domain_id; | |
5314af69 FB |
105 | /* Flag to check if domain was set through module parameter domain=. This is |
106 | * important when supsend and resume is done in a z/VM environment where the | |
107 | * domain might change. */ | |
108 | static int user_set_domain = 0; | |
772f5472 FB |
109 | static struct bus_type ap_bus_type; |
110 | ||
f4eae94f | 111 | /* Adapter interrupt definitions */ |
3f3007af MS |
112 | static void ap_interrupt_handler(struct airq_struct *airq); |
113 | ||
f4eae94f MS |
114 | static int ap_airq_flag; |
115 | ||
116 | static struct airq_struct ap_airq = { | |
117 | .handler = ap_interrupt_handler, | |
118 | .isc = AP_ISC, | |
119 | }; | |
120 | ||
cb17a636 FB |
121 | /** |
122 | * ap_using_interrupts() - Returns non-zero if interrupt support is | |
123 | * available. | |
124 | */ | |
125 | static inline int ap_using_interrupts(void) | |
126 | { | |
f4eae94f | 127 | return ap_airq_flag; |
cb17a636 FB |
128 | } |
129 | ||
1534c382 | 130 | /** |
1749a81d | 131 | * ap_intructions_available() - Test if AP instructions are available. |
1534c382 | 132 | * |
1749a81d | 133 | * Returns 0 if the AP instructions are installed. |
1534c382 MS |
134 | */ |
135 | static inline int ap_instructions_available(void) | |
136 | { | |
137 | register unsigned long reg0 asm ("0") = AP_MKQID(0,0); | |
138 | register unsigned long reg1 asm ("1") = -ENODEV; | |
139 | register unsigned long reg2 asm ("2") = 0UL; | |
140 | ||
141 | asm volatile( | |
142 | " .long 0xb2af0000\n" /* PQAP(TAPQ) */ | |
143 | "0: la %1,0\n" | |
144 | "1:\n" | |
145 | EX_TABLE(0b, 1b) | |
146 | : "+d" (reg0), "+d" (reg1), "+d" (reg2) : : "cc" ); | |
147 | return reg1; | |
148 | } | |
149 | ||
cb17a636 FB |
150 | /** |
151 | * ap_interrupts_available(): Test if AP interrupts are available. | |
152 | * | |
153 | * Returns 1 if AP interrupts are available. | |
154 | */ | |
155 | static int ap_interrupts_available(void) | |
156 | { | |
86cd741b | 157 | return test_facility(65); |
cb17a636 FB |
158 | } |
159 | ||
75014550 HD |
160 | /** |
161 | * ap_configuration_available(): Test if AP configuration | |
162 | * information is available. | |
163 | * | |
164 | * Returns 1 if AP configuration information is available. | |
165 | */ | |
166 | static int ap_configuration_available(void) | |
167 | { | |
86cd741b | 168 | return test_facility(12); |
75014550 HD |
169 | } |
170 | ||
1534c382 | 171 | /** |
1749a81d FB |
172 | * ap_test_queue(): Test adjunct processor queue. |
173 | * @qid: The AP queue number | |
6acbe21f | 174 | * @info: Pointer to queue descriptor |
1534c382 | 175 | * |
1749a81d | 176 | * Returns AP queue status structure. |
1534c382 MS |
177 | */ |
178 | static inline struct ap_queue_status | |
6acbe21f | 179 | ap_test_queue(ap_qid_t qid, unsigned long *info) |
1534c382 MS |
180 | { |
181 | register unsigned long reg0 asm ("0") = qid; | |
182 | register struct ap_queue_status reg1 asm ("1"); | |
183 | register unsigned long reg2 asm ("2") = 0UL; | |
184 | ||
6acbe21f MS |
185 | if (test_facility(15)) |
186 | reg0 |= 1UL << 23; /* set APFT T bit*/ | |
1534c382 MS |
187 | asm volatile(".long 0xb2af0000" /* PQAP(TAPQ) */ |
188 | : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc"); | |
6acbe21f MS |
189 | if (info) |
190 | *info = reg2; | |
1534c382 MS |
191 | return reg1; |
192 | } | |
193 | ||
194 | /** | |
1749a81d FB |
195 | * ap_reset_queue(): Reset adjunct processor queue. |
196 | * @qid: The AP queue number | |
1534c382 | 197 | * |
1749a81d | 198 | * Returns AP queue status structure. |
1534c382 MS |
199 | */ |
200 | static inline struct ap_queue_status ap_reset_queue(ap_qid_t qid) | |
201 | { | |
202 | register unsigned long reg0 asm ("0") = qid | 0x01000000UL; | |
203 | register struct ap_queue_status reg1 asm ("1"); | |
204 | register unsigned long reg2 asm ("2") = 0UL; | |
205 | ||
206 | asm volatile( | |
207 | ".long 0xb2af0000" /* PQAP(RAPQ) */ | |
208 | : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc"); | |
209 | return reg1; | |
210 | } | |
211 | ||
cb17a636 FB |
212 | /** |
213 | * ap_queue_interruption_control(): Enable interruption for a specific AP. | |
214 | * @qid: The AP queue number | |
215 | * @ind: The notification indicator byte | |
216 | * | |
217 | * Returns AP queue status. | |
218 | */ | |
219 | static inline struct ap_queue_status | |
220 | ap_queue_interruption_control(ap_qid_t qid, void *ind) | |
221 | { | |
222 | register unsigned long reg0 asm ("0") = qid | 0x03000000UL; | |
223 | register unsigned long reg1_in asm ("1") = 0x0000800000000000UL | AP_ISC; | |
224 | register struct ap_queue_status reg1_out asm ("1"); | |
225 | register void *reg2 asm ("2") = ind; | |
226 | asm volatile( | |
a7475afd | 227 | ".long 0xb2af0000" /* PQAP(AQIC) */ |
cb17a636 FB |
228 | : "+d" (reg0), "+d" (reg1_in), "=d" (reg1_out), "+d" (reg2) |
229 | : | |
230 | : "cc" ); | |
231 | return reg1_out; | |
232 | } | |
cb17a636 | 233 | |
889875a1 MS |
234 | /** |
235 | * ap_query_configuration(): Get AP configuration data | |
236 | * | |
237 | * Returns 0 on success, or -EOPNOTSUPP. | |
238 | */ | |
239 | static inline int ap_query_configuration(void) | |
75014550 HD |
240 | { |
241 | register unsigned long reg0 asm ("0") = 0x04000000UL; | |
242 | register unsigned long reg1 asm ("1") = -EINVAL; | |
889875a1 | 243 | register void *reg2 asm ("2") = (void *) ap_configuration; |
75014550 | 244 | |
889875a1 MS |
245 | if (!ap_configuration) |
246 | return -EOPNOTSUPP; | |
75014550 HD |
247 | asm volatile( |
248 | ".long 0xb2af0000\n" /* PQAP(QCI) */ | |
249 | "0: la %1,0\n" | |
250 | "1:\n" | |
251 | EX_TABLE(0b, 1b) | |
252 | : "+d" (reg0), "+d" (reg1), "+d" (reg2) | |
253 | : | |
254 | : "cc"); | |
255 | ||
256 | return reg1; | |
257 | } | |
75014550 | 258 | |
889875a1 MS |
259 | /** |
260 | * ap_init_configuration(): Allocate and query configuration array. | |
261 | */ | |
262 | static void ap_init_configuration(void) | |
263 | { | |
264 | if (!ap_configuration_available()) | |
265 | return; | |
266 | ||
267 | ap_configuration = kzalloc(sizeof(*ap_configuration), GFP_KERNEL); | |
268 | if (!ap_configuration) | |
269 | return; | |
270 | if (ap_query_configuration() != 0) { | |
271 | kfree(ap_configuration); | |
272 | ap_configuration = NULL; | |
273 | return; | |
274 | } | |
275 | } | |
276 | ||
277 | /* | |
278 | * ap_test_config(): helper function to extract the nrth bit | |
279 | * within the unsigned int array field. | |
280 | */ | |
281 | static inline int ap_test_config(unsigned int *field, unsigned int nr) | |
282 | { | |
283 | return ap_test_bit((field + (nr >> 5)), (nr & 0x1f)); | |
284 | } | |
285 | ||
286 | /* | |
287 | * ap_test_config_card_id(): Test, whether an AP card ID is configured. | |
288 | * @id AP card ID | |
289 | * | |
290 | * Returns 0 if the card is not configured | |
291 | * 1 if the card is configured or | |
292 | * if the configuration information is not available | |
293 | */ | |
294 | static inline int ap_test_config_card_id(unsigned int id) | |
295 | { | |
296 | if (!ap_configuration) /* QCI not supported */ | |
297 | return 1; | |
298 | return ap_test_config(ap_configuration->apm, id); | |
299 | } | |
300 | ||
301 | /* | |
302 | * ap_test_config_domain(): Test, whether an AP usage domain is configured. | |
303 | * @domain AP usage domain ID | |
304 | * | |
305 | * Returns 0 if the usage domain is not configured | |
306 | * 1 if the usage domain is configured or | |
307 | * if the configuration information is not available | |
308 | */ | |
309 | static inline int ap_test_config_domain(unsigned int domain) | |
310 | { | |
311 | if (!ap_configuration) /* QCI not supported */ | |
312 | return domain < 16; | |
313 | return ap_test_config(ap_configuration->aqm, domain); | |
314 | } | |
315 | ||
cb17a636 FB |
316 | /** |
317 | * ap_queue_enable_interruption(): Enable interruption on an AP. | |
318 | * @qid: The AP queue number | |
319 | * @ind: the notification indicator byte | |
320 | * | |
321 | * Enables interruption on AP queue via ap_queue_interruption_control(). Based | |
322 | * on the return value it waits a while and tests the AP queue if interrupts | |
323 | * have been switched on using ap_test_queue(). | |
324 | */ | |
c50a160c | 325 | static int ap_queue_enable_interruption(struct ap_device *ap_dev, void *ind) |
cb17a636 | 326 | { |
cb17a636 | 327 | struct ap_queue_status status; |
cb17a636 | 328 | |
c50a160c IT |
329 | status = ap_queue_interruption_control(ap_dev->qid, ind); |
330 | switch (status.response_code) { | |
331 | case AP_RESPONSE_NORMAL: | |
332 | case AP_RESPONSE_OTHERWISE_CHANGED: | |
333 | return 0; | |
334 | case AP_RESPONSE_Q_NOT_AVAIL: | |
335 | case AP_RESPONSE_DECONFIGURED: | |
336 | case AP_RESPONSE_CHECKSTOPPED: | |
337 | case AP_RESPONSE_INVALID_ADDRESS: | |
3f3007af MS |
338 | pr_err("Registering adapter interrupts for AP %d failed\n", |
339 | AP_QID_DEVICE(ap_dev->qid)); | |
340 | return -EOPNOTSUPP; | |
c50a160c IT |
341 | case AP_RESPONSE_RESET_IN_PROGRESS: |
342 | case AP_RESPONSE_BUSY: | |
343 | default: | |
344 | return -EBUSY; | |
cb17a636 | 345 | } |
cb17a636 FB |
346 | } |
347 | ||
1534c382 | 348 | /** |
1749a81d FB |
349 | * __ap_send(): Send message to adjunct processor queue. |
350 | * @qid: The AP queue number | |
351 | * @psmid: The program supplied message identifier | |
352 | * @msg: The message text | |
353 | * @length: The message length | |
a6a5d73a | 354 | * @special: Special Bit |
1534c382 | 355 | * |
1749a81d | 356 | * Returns AP queue status structure. |
1534c382 | 357 | * Condition code 1 on NQAP can't happen because the L bit is 1. |
1534c382 MS |
358 | * Condition code 2 on NQAP also means the send is incomplete, |
359 | * because a segment boundary was reached. The NQAP is repeated. | |
360 | */ | |
361 | static inline struct ap_queue_status | |
a6a5d73a FB |
362 | __ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length, |
363 | unsigned int special) | |
1534c382 MS |
364 | { |
365 | typedef struct { char _[length]; } msgblock; | |
366 | register unsigned long reg0 asm ("0") = qid | 0x40000000UL; | |
367 | register struct ap_queue_status reg1 asm ("1"); | |
368 | register unsigned long reg2 asm ("2") = (unsigned long) msg; | |
369 | register unsigned long reg3 asm ("3") = (unsigned long) length; | |
370 | register unsigned long reg4 asm ("4") = (unsigned int) (psmid >> 32); | |
7d6c3b49 | 371 | register unsigned long reg5 asm ("5") = psmid & 0xffffffff; |
1534c382 | 372 | |
a6a5d73a FB |
373 | if (special == 1) |
374 | reg0 |= 0x400000UL; | |
375 | ||
1534c382 | 376 | asm volatile ( |
a7475afd | 377 | "0: .long 0xb2ad0042\n" /* NQAP */ |
1534c382 MS |
378 | " brc 2,0b" |
379 | : "+d" (reg0), "=d" (reg1), "+d" (reg2), "+d" (reg3) | |
380 | : "d" (reg4), "d" (reg5), "m" (*(msgblock *) msg) | |
381 | : "cc" ); | |
382 | return reg1; | |
383 | } | |
384 | ||
385 | int ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length) | |
386 | { | |
387 | struct ap_queue_status status; | |
388 | ||
a6a5d73a | 389 | status = __ap_send(qid, psmid, msg, length, 0); |
1534c382 MS |
390 | switch (status.response_code) { |
391 | case AP_RESPONSE_NORMAL: | |
392 | return 0; | |
393 | case AP_RESPONSE_Q_FULL: | |
af512ed0 | 394 | case AP_RESPONSE_RESET_IN_PROGRESS: |
1534c382 | 395 | return -EBUSY; |
a6a5d73a FB |
396 | case AP_RESPONSE_REQ_FAC_NOT_INST: |
397 | return -EINVAL; | |
1534c382 MS |
398 | default: /* Device is gone. */ |
399 | return -ENODEV; | |
400 | } | |
401 | } | |
402 | EXPORT_SYMBOL(ap_send); | |
403 | ||
1749a81d FB |
404 | /** |
405 | * __ap_recv(): Receive message from adjunct processor queue. | |
406 | * @qid: The AP queue number | |
407 | * @psmid: Pointer to program supplied message identifier | |
408 | * @msg: The message text | |
409 | * @length: The message length | |
1534c382 | 410 | * |
1749a81d | 411 | * Returns AP queue status structure. |
1534c382 MS |
412 | * Condition code 1 on DQAP means the receive has taken place |
413 | * but only partially. The response is incomplete, hence the | |
414 | * DQAP is repeated. | |
1534c382 MS |
415 | * Condition code 2 on DQAP also means the receive is incomplete, |
416 | * this time because a segment boundary was reached. Again, the | |
417 | * DQAP is repeated. | |
1534c382 MS |
418 | * Note that gpr2 is used by the DQAP instruction to keep track of |
419 | * any 'residual' length, in case the instruction gets interrupted. | |
420 | * Hence it gets zeroed before the instruction. | |
421 | */ | |
422 | static inline struct ap_queue_status | |
423 | __ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length) | |
424 | { | |
425 | typedef struct { char _[length]; } msgblock; | |
426 | register unsigned long reg0 asm("0") = qid | 0x80000000UL; | |
427 | register struct ap_queue_status reg1 asm ("1"); | |
428 | register unsigned long reg2 asm("2") = 0UL; | |
429 | register unsigned long reg4 asm("4") = (unsigned long) msg; | |
430 | register unsigned long reg5 asm("5") = (unsigned long) length; | |
431 | register unsigned long reg6 asm("6") = 0UL; | |
432 | register unsigned long reg7 asm("7") = 0UL; | |
433 | ||
434 | ||
435 | asm volatile( | |
a7475afd | 436 | "0: .long 0xb2ae0064\n" /* DQAP */ |
1534c382 MS |
437 | " brc 6,0b\n" |
438 | : "+d" (reg0), "=d" (reg1), "+d" (reg2), | |
439 | "+d" (reg4), "+d" (reg5), "+d" (reg6), "+d" (reg7), | |
440 | "=m" (*(msgblock *) msg) : : "cc" ); | |
441 | *psmid = (((unsigned long long) reg6) << 32) + reg7; | |
442 | return reg1; | |
443 | } | |
444 | ||
445 | int ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length) | |
446 | { | |
447 | struct ap_queue_status status; | |
448 | ||
449 | status = __ap_recv(qid, psmid, msg, length); | |
450 | switch (status.response_code) { | |
451 | case AP_RESPONSE_NORMAL: | |
452 | return 0; | |
453 | case AP_RESPONSE_NO_PENDING_REPLY: | |
454 | if (status.queue_empty) | |
455 | return -ENOENT; | |
456 | return -EBUSY; | |
af512ed0 RW |
457 | case AP_RESPONSE_RESET_IN_PROGRESS: |
458 | return -EBUSY; | |
1534c382 MS |
459 | default: |
460 | return -ENODEV; | |
461 | } | |
462 | } | |
463 | EXPORT_SYMBOL(ap_recv); | |
464 | ||
465 | /** | |
1749a81d FB |
466 | * ap_query_queue(): Check if an AP queue is available. |
467 | * @qid: The AP queue number | |
468 | * @queue_depth: Pointer to queue depth value | |
469 | * @device_type: Pointer to device type value | |
6acbe21f | 470 | * @facilities: Pointer to facility indicator |
1534c382 | 471 | */ |
6acbe21f MS |
472 | static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type, |
473 | unsigned int *facilities) | |
1534c382 MS |
474 | { |
475 | struct ap_queue_status status; | |
6acbe21f | 476 | unsigned long info; |
889875a1 MS |
477 | int nd; |
478 | ||
479 | if (!ap_test_config_card_id(AP_QID_DEVICE(qid))) | |
480 | return -ENODEV; | |
1534c382 | 481 | |
6acbe21f | 482 | status = ap_test_queue(qid, &info); |
c50a160c IT |
483 | switch (status.response_code) { |
484 | case AP_RESPONSE_NORMAL: | |
6acbe21f MS |
485 | *queue_depth = (int)(info & 0xff); |
486 | *device_type = (int)((info >> 24) & 0xff); | |
487 | *facilities = (unsigned int)(info >> 32); | |
889875a1 MS |
488 | /* Update maximum domain id */ |
489 | nd = (info >> 16) & 0xff; | |
490 | if ((info & (1UL << 57)) && nd > 0) | |
491 | ap_max_domain_id = nd; | |
c50a160c IT |
492 | return 0; |
493 | case AP_RESPONSE_Q_NOT_AVAIL: | |
494 | case AP_RESPONSE_DECONFIGURED: | |
495 | case AP_RESPONSE_CHECKSTOPPED: | |
496 | case AP_RESPONSE_INVALID_ADDRESS: | |
497 | return -ENODEV; | |
498 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
499 | case AP_RESPONSE_OTHERWISE_CHANGED: | |
500 | case AP_RESPONSE_BUSY: | |
501 | return -EBUSY; | |
502 | default: | |
503 | BUG(); | |
1534c382 | 504 | } |
1534c382 MS |
505 | } |
506 | ||
3f3007af MS |
507 | /* State machine definitions and helpers */ |
508 | ||
509 | static void ap_sm_wait(enum ap_wait wait) | |
510 | { | |
511 | ktime_t hr_time; | |
512 | ||
513 | switch (wait) { | |
514 | case AP_WAIT_AGAIN: | |
515 | case AP_WAIT_INTERRUPT: | |
516 | if (ap_using_interrupts()) | |
517 | break; | |
518 | if (ap_poll_kthread) { | |
519 | wake_up(&ap_poll_wait); | |
520 | break; | |
521 | } | |
522 | /* Fall through */ | |
523 | case AP_WAIT_TIMEOUT: | |
524 | spin_lock_bh(&ap_poll_timer_lock); | |
525 | if (!hrtimer_is_queued(&ap_poll_timer)) { | |
526 | hr_time = ktime_set(0, poll_timeout); | |
527 | hrtimer_forward_now(&ap_poll_timer, hr_time); | |
528 | hrtimer_restart(&ap_poll_timer); | |
529 | } | |
530 | spin_unlock_bh(&ap_poll_timer_lock); | |
531 | break; | |
532 | case AP_WAIT_NONE: | |
533 | default: | |
534 | break; | |
535 | } | |
536 | } | |
537 | ||
538 | static enum ap_wait ap_sm_nop(struct ap_device *ap_dev) | |
539 | { | |
540 | return AP_WAIT_NONE; | |
541 | } | |
542 | ||
543 | /** | |
544 | * ap_sm_recv(): Receive pending reply messages from an AP device but do | |
545 | * not change the state of the device. | |
546 | * @ap_dev: pointer to the AP device | |
547 | * | |
548 | * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT | |
549 | */ | |
550 | static struct ap_queue_status ap_sm_recv(struct ap_device *ap_dev) | |
551 | { | |
552 | struct ap_queue_status status; | |
553 | struct ap_message *ap_msg; | |
554 | ||
555 | status = __ap_recv(ap_dev->qid, &ap_dev->reply->psmid, | |
556 | ap_dev->reply->message, ap_dev->reply->length); | |
557 | switch (status.response_code) { | |
558 | case AP_RESPONSE_NORMAL: | |
559 | atomic_dec(&ap_poll_requests); | |
560 | ap_dev->queue_count--; | |
561 | if (ap_dev->queue_count > 0) | |
562 | mod_timer(&ap_dev->timeout, | |
563 | jiffies + ap_dev->drv->request_timeout); | |
564 | list_for_each_entry(ap_msg, &ap_dev->pendingq, list) { | |
565 | if (ap_msg->psmid != ap_dev->reply->psmid) | |
566 | continue; | |
567 | list_del_init(&ap_msg->list); | |
568 | ap_dev->pendingq_count--; | |
569 | ap_msg->receive(ap_dev, ap_msg, ap_dev->reply); | |
570 | break; | |
571 | } | |
572 | case AP_RESPONSE_NO_PENDING_REPLY: | |
573 | if (!status.queue_empty || ap_dev->queue_count <= 0) | |
574 | break; | |
575 | /* The card shouldn't forget requests but who knows. */ | |
576 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); | |
577 | ap_dev->queue_count = 0; | |
578 | list_splice_init(&ap_dev->pendingq, &ap_dev->requestq); | |
579 | ap_dev->requestq_count += ap_dev->pendingq_count; | |
580 | ap_dev->pendingq_count = 0; | |
581 | break; | |
582 | default: | |
583 | break; | |
584 | } | |
585 | return status; | |
586 | } | |
587 | ||
588 | /** | |
589 | * ap_sm_read(): Receive pending reply messages from an AP device. | |
590 | * @ap_dev: pointer to the AP device | |
591 | * | |
592 | * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT | |
593 | */ | |
594 | static enum ap_wait ap_sm_read(struct ap_device *ap_dev) | |
595 | { | |
596 | struct ap_queue_status status; | |
597 | ||
598 | status = ap_sm_recv(ap_dev); | |
599 | switch (status.response_code) { | |
600 | case AP_RESPONSE_NORMAL: | |
601 | if (ap_dev->queue_count > 0) | |
602 | return AP_WAIT_AGAIN; | |
603 | ap_dev->state = AP_STATE_IDLE; | |
604 | return AP_WAIT_NONE; | |
605 | case AP_RESPONSE_NO_PENDING_REPLY: | |
606 | if (ap_dev->queue_count > 0) | |
607 | return AP_WAIT_INTERRUPT; | |
608 | ap_dev->state = AP_STATE_IDLE; | |
609 | return AP_WAIT_NONE; | |
610 | default: | |
611 | ap_dev->state = AP_STATE_BORKED; | |
612 | return AP_WAIT_NONE; | |
613 | } | |
614 | } | |
615 | ||
616 | /** | |
617 | * ap_sm_write(): Send messages from the request queue to an AP device. | |
618 | * @ap_dev: pointer to the AP device | |
619 | * | |
620 | * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT | |
621 | */ | |
622 | static enum ap_wait ap_sm_write(struct ap_device *ap_dev) | |
623 | { | |
624 | struct ap_queue_status status; | |
625 | struct ap_message *ap_msg; | |
626 | ||
627 | if (ap_dev->requestq_count <= 0) | |
628 | return AP_WAIT_NONE; | |
629 | /* Start the next request on the queue. */ | |
630 | ap_msg = list_entry(ap_dev->requestq.next, struct ap_message, list); | |
631 | status = __ap_send(ap_dev->qid, ap_msg->psmid, | |
632 | ap_msg->message, ap_msg->length, ap_msg->special); | |
633 | switch (status.response_code) { | |
634 | case AP_RESPONSE_NORMAL: | |
635 | atomic_inc(&ap_poll_requests); | |
636 | ap_dev->queue_count++; | |
637 | if (ap_dev->queue_count == 1) | |
638 | mod_timer(&ap_dev->timeout, | |
639 | jiffies + ap_dev->drv->request_timeout); | |
640 | list_move_tail(&ap_msg->list, &ap_dev->pendingq); | |
641 | ap_dev->requestq_count--; | |
642 | ap_dev->pendingq_count++; | |
643 | if (ap_dev->queue_count < ap_dev->queue_depth) { | |
644 | ap_dev->state = AP_STATE_WORKING; | |
645 | return AP_WAIT_AGAIN; | |
646 | } | |
647 | /* fall through */ | |
648 | case AP_RESPONSE_Q_FULL: | |
649 | ap_dev->state = AP_STATE_QUEUE_FULL; | |
650 | return AP_WAIT_INTERRUPT; | |
651 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
652 | ap_dev->state = AP_STATE_RESET_WAIT; | |
653 | return AP_WAIT_TIMEOUT; | |
654 | case AP_RESPONSE_MESSAGE_TOO_BIG: | |
655 | case AP_RESPONSE_REQ_FAC_NOT_INST: | |
656 | list_del_init(&ap_msg->list); | |
657 | ap_dev->requestq_count--; | |
658 | ap_msg->rc = -EINVAL; | |
659 | ap_msg->receive(ap_dev, ap_msg, NULL); | |
660 | return AP_WAIT_AGAIN; | |
661 | default: | |
662 | ap_dev->state = AP_STATE_BORKED; | |
663 | return AP_WAIT_NONE; | |
664 | } | |
665 | } | |
666 | ||
1534c382 | 667 | /** |
3f3007af MS |
668 | * ap_sm_read_write(): Send and receive messages to/from an AP device. |
669 | * @ap_dev: pointer to the AP device | |
670 | * | |
671 | * Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT | |
672 | */ | |
673 | static enum ap_wait ap_sm_read_write(struct ap_device *ap_dev) | |
674 | { | |
675 | return min(ap_sm_read(ap_dev), ap_sm_write(ap_dev)); | |
676 | } | |
677 | ||
678 | /** | |
679 | * ap_sm_reset(): Reset an AP queue. | |
1749a81d FB |
680 | * @qid: The AP queue number |
681 | * | |
c50a160c | 682 | * Submit the Reset command to an AP queue. |
1534c382 | 683 | */ |
3f3007af | 684 | static enum ap_wait ap_sm_reset(struct ap_device *ap_dev) |
1534c382 MS |
685 | { |
686 | struct ap_queue_status status; | |
1534c382 | 687 | |
c50a160c IT |
688 | status = ap_reset_queue(ap_dev->qid); |
689 | switch (status.response_code) { | |
690 | case AP_RESPONSE_NORMAL: | |
c50a160c | 691 | case AP_RESPONSE_RESET_IN_PROGRESS: |
3f3007af MS |
692 | ap_dev->state = AP_STATE_RESET_WAIT; |
693 | ap_dev->interrupt = AP_INTR_DISABLED; | |
694 | return AP_WAIT_TIMEOUT; | |
c50a160c | 695 | case AP_RESPONSE_BUSY: |
3f3007af | 696 | return AP_WAIT_TIMEOUT; |
c50a160c IT |
697 | case AP_RESPONSE_Q_NOT_AVAIL: |
698 | case AP_RESPONSE_DECONFIGURED: | |
699 | case AP_RESPONSE_CHECKSTOPPED: | |
700 | default: | |
3f3007af MS |
701 | ap_dev->state = AP_STATE_BORKED; |
702 | return AP_WAIT_NONE; | |
cb17a636 | 703 | } |
1534c382 MS |
704 | } |
705 | ||
af512ed0 | 706 | /** |
3f3007af MS |
707 | * ap_sm_reset_wait(): Test queue for completion of the reset operation |
708 | * @ap_dev: pointer to the AP device | |
1749a81d | 709 | * |
3f3007af | 710 | * Returns AP_POLL_IMMEDIATELY, AP_POLL_AFTER_TIMEROUT or 0. |
af512ed0 | 711 | */ |
3f3007af | 712 | static enum ap_wait ap_sm_reset_wait(struct ap_device *ap_dev) |
af512ed0 | 713 | { |
3f3007af MS |
714 | struct ap_queue_status status; |
715 | unsigned long info; | |
af512ed0 | 716 | |
3f3007af MS |
717 | if (ap_dev->queue_count > 0) |
718 | /* Try to read a completed message and get the status */ | |
719 | status = ap_sm_recv(ap_dev); | |
720 | else | |
721 | /* Get the status with TAPQ */ | |
722 | status = ap_test_queue(ap_dev->qid, &info); | |
723 | ||
724 | switch (status.response_code) { | |
725 | case AP_RESPONSE_NORMAL: | |
726 | if (ap_using_interrupts() && | |
727 | ap_queue_enable_interruption(ap_dev, | |
728 | ap_airq.lsi_ptr) == 0) | |
729 | ap_dev->state = AP_STATE_SETIRQ_WAIT; | |
730 | else | |
731 | ap_dev->state = (ap_dev->queue_count > 0) ? | |
732 | AP_STATE_WORKING : AP_STATE_IDLE; | |
733 | return AP_WAIT_AGAIN; | |
734 | case AP_RESPONSE_BUSY: | |
735 | case AP_RESPONSE_RESET_IN_PROGRESS: | |
736 | return AP_WAIT_TIMEOUT; | |
737 | case AP_RESPONSE_Q_NOT_AVAIL: | |
738 | case AP_RESPONSE_DECONFIGURED: | |
739 | case AP_RESPONSE_CHECKSTOPPED: | |
740 | default: | |
741 | ap_dev->state = AP_STATE_BORKED; | |
742 | return AP_WAIT_NONE; | |
af512ed0 RW |
743 | } |
744 | } | |
745 | ||
746 | /** | |
3f3007af MS |
747 | * ap_sm_setirq_wait(): Test queue for completion of the irq enablement |
748 | * @ap_dev: pointer to the AP device | |
1749a81d | 749 | * |
3f3007af | 750 | * Returns AP_POLL_IMMEDIATELY, AP_POLL_AFTER_TIMEROUT or 0. |
af512ed0 | 751 | */ |
3f3007af | 752 | static enum ap_wait ap_sm_setirq_wait(struct ap_device *ap_dev) |
af512ed0 | 753 | { |
3f3007af MS |
754 | struct ap_queue_status status; |
755 | unsigned long info; | |
af512ed0 | 756 | |
af512ed0 | 757 | if (ap_dev->queue_count > 0) |
3f3007af MS |
758 | /* Try to read a completed message and get the status */ |
759 | status = ap_sm_recv(ap_dev); | |
af512ed0 | 760 | else |
3f3007af MS |
761 | /* Get the status with TAPQ */ |
762 | status = ap_test_queue(ap_dev->qid, &info); | |
763 | ||
764 | if (status.int_enabled == 1) { | |
765 | /* Irqs are now enabled */ | |
766 | ap_dev->interrupt = AP_INTR_ENABLED; | |
767 | ap_dev->state = (ap_dev->queue_count > 0) ? | |
768 | AP_STATE_WORKING : AP_STATE_IDLE; | |
769 | } | |
770 | ||
771 | switch (status.response_code) { | |
772 | case AP_RESPONSE_NORMAL: | |
773 | if (ap_dev->queue_count > 0) | |
774 | return AP_WAIT_AGAIN; | |
775 | /* fallthrough */ | |
776 | case AP_RESPONSE_NO_PENDING_REPLY: | |
777 | return AP_WAIT_TIMEOUT; | |
778 | default: | |
779 | ap_dev->state = AP_STATE_BORKED; | |
780 | return AP_WAIT_NONE; | |
781 | } | |
782 | } | |
783 | ||
784 | /* | |
785 | * AP state machine jump table | |
786 | */ | |
787 | ap_func_t *ap_jumptable[NR_AP_STATES][NR_AP_EVENTS] = { | |
788 | [AP_STATE_RESET_START] = { | |
789 | [AP_EVENT_POLL] = ap_sm_reset, | |
790 | [AP_EVENT_TIMEOUT] = ap_sm_nop, | |
791 | }, | |
792 | [AP_STATE_RESET_WAIT] = { | |
793 | [AP_EVENT_POLL] = ap_sm_reset_wait, | |
794 | [AP_EVENT_TIMEOUT] = ap_sm_nop, | |
795 | }, | |
796 | [AP_STATE_SETIRQ_WAIT] = { | |
797 | [AP_EVENT_POLL] = ap_sm_setirq_wait, | |
798 | [AP_EVENT_TIMEOUT] = ap_sm_nop, | |
799 | }, | |
800 | [AP_STATE_IDLE] = { | |
801 | [AP_EVENT_POLL] = ap_sm_write, | |
802 | [AP_EVENT_TIMEOUT] = ap_sm_nop, | |
803 | }, | |
804 | [AP_STATE_WORKING] = { | |
805 | [AP_EVENT_POLL] = ap_sm_read_write, | |
806 | [AP_EVENT_TIMEOUT] = ap_sm_reset, | |
807 | }, | |
808 | [AP_STATE_QUEUE_FULL] = { | |
809 | [AP_EVENT_POLL] = ap_sm_read, | |
810 | [AP_EVENT_TIMEOUT] = ap_sm_reset, | |
811 | }, | |
812 | [AP_STATE_SUSPEND_WAIT] = { | |
813 | [AP_EVENT_POLL] = ap_sm_read, | |
814 | [AP_EVENT_TIMEOUT] = ap_sm_nop, | |
815 | }, | |
816 | [AP_STATE_BORKED] = { | |
817 | [AP_EVENT_POLL] = ap_sm_nop, | |
818 | [AP_EVENT_TIMEOUT] = ap_sm_nop, | |
819 | }, | |
820 | }; | |
821 | ||
822 | static inline enum ap_wait ap_sm_event(struct ap_device *ap_dev, | |
823 | enum ap_event event) | |
824 | { | |
825 | return ap_jumptable[ap_dev->state][event](ap_dev); | |
826 | } | |
827 | ||
828 | static inline enum ap_wait ap_sm_event_loop(struct ap_device *ap_dev, | |
829 | enum ap_event event) | |
830 | { | |
831 | enum ap_wait wait; | |
832 | ||
833 | while ((wait = ap_sm_event(ap_dev, event)) == AP_WAIT_AGAIN) | |
834 | ; | |
835 | return wait; | |
836 | } | |
837 | ||
838 | /** | |
839 | * ap_request_timeout(): Handling of request timeouts | |
840 | * @data: Holds the AP device. | |
841 | * | |
842 | * Handles request timeouts. | |
843 | */ | |
844 | static void ap_request_timeout(unsigned long data) | |
845 | { | |
846 | struct ap_device *ap_dev = (struct ap_device *) data; | |
847 | ||
848 | if (ap_suspend_flag) | |
849 | return; | |
850 | spin_lock_bh(&ap_dev->lock); | |
851 | ap_sm_wait(ap_sm_event(ap_dev, AP_EVENT_TIMEOUT)); | |
852 | spin_unlock_bh(&ap_dev->lock); | |
853 | } | |
854 | ||
855 | /** | |
856 | * ap_poll_timeout(): AP receive polling for finished AP requests. | |
857 | * @unused: Unused pointer. | |
858 | * | |
859 | * Schedules the AP tasklet using a high resolution timer. | |
860 | */ | |
861 | static enum hrtimer_restart ap_poll_timeout(struct hrtimer *unused) | |
862 | { | |
863 | if (!ap_suspend_flag) | |
864 | tasklet_schedule(&ap_tasklet); | |
865 | return HRTIMER_NORESTART; | |
866 | } | |
867 | ||
868 | /** | |
869 | * ap_interrupt_handler() - Schedule ap_tasklet on interrupt | |
870 | * @airq: pointer to adapter interrupt descriptor | |
871 | */ | |
872 | static void ap_interrupt_handler(struct airq_struct *airq) | |
873 | { | |
874 | inc_irq_stat(IRQIO_APB); | |
875 | if (!ap_suspend_flag) | |
876 | tasklet_schedule(&ap_tasklet); | |
877 | } | |
878 | ||
879 | /** | |
880 | * ap_tasklet_fn(): Tasklet to poll all AP devices. | |
881 | * @dummy: Unused variable | |
882 | * | |
883 | * Poll all AP devices on the bus. | |
884 | */ | |
885 | static void ap_tasklet_fn(unsigned long dummy) | |
886 | { | |
887 | struct ap_device *ap_dev; | |
888 | enum ap_wait wait = AP_WAIT_NONE; | |
889 | ||
890 | /* Reset the indicator if interrupts are used. Thus new interrupts can | |
891 | * be received. Doing it in the beginning of the tasklet is therefor | |
892 | * important that no requests on any AP get lost. | |
893 | */ | |
894 | if (ap_using_interrupts()) | |
895 | xchg(ap_airq.lsi_ptr, 0); | |
896 | ||
897 | spin_lock(&ap_device_list_lock); | |
898 | list_for_each_entry(ap_dev, &ap_device_list, list) { | |
899 | spin_lock_bh(&ap_dev->lock); | |
900 | wait = min(wait, ap_sm_event_loop(ap_dev, AP_EVENT_POLL)); | |
901 | spin_unlock_bh(&ap_dev->lock); | |
902 | } | |
903 | spin_unlock(&ap_device_list_lock); | |
904 | ap_sm_wait(wait); | |
af512ed0 RW |
905 | } |
906 | ||
83e9d5d2 MS |
907 | /** |
908 | * ap_poll_thread(): Thread that polls for finished requests. | |
909 | * @data: Unused pointer | |
910 | * | |
911 | * AP bus poll thread. The purpose of this thread is to poll for | |
912 | * finished requests in a loop if there is a "free" cpu - that is | |
913 | * a cpu that doesn't have anything better to do. The polling stops | |
914 | * as soon as there is another task or if all messages have been | |
915 | * delivered. | |
916 | */ | |
917 | static int ap_poll_thread(void *data) | |
918 | { | |
919 | DECLARE_WAITQUEUE(wait, current); | |
83e9d5d2 MS |
920 | |
921 | set_user_nice(current, MAX_NICE); | |
922 | set_freezable(); | |
923 | while (!kthread_should_stop()) { | |
924 | add_wait_queue(&ap_poll_wait, &wait); | |
925 | set_current_state(TASK_INTERRUPTIBLE); | |
926 | if (ap_suspend_flag || | |
927 | atomic_read(&ap_poll_requests) <= 0) { | |
928 | schedule(); | |
929 | try_to_freeze(); | |
930 | } | |
931 | set_current_state(TASK_RUNNING); | |
932 | remove_wait_queue(&ap_poll_wait, &wait); | |
83e9d5d2 MS |
933 | if (need_resched()) { |
934 | schedule(); | |
935 | try_to_freeze(); | |
936 | continue; | |
937 | } | |
3f3007af | 938 | ap_tasklet_fn(0); |
83e9d5d2 MS |
939 | } while (!kthread_should_stop()); |
940 | return 0; | |
941 | } | |
942 | ||
943 | static int ap_poll_thread_start(void) | |
944 | { | |
945 | int rc; | |
946 | ||
947 | if (ap_using_interrupts() || ap_poll_kthread) | |
948 | return 0; | |
949 | mutex_lock(&ap_poll_thread_mutex); | |
950 | ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll"); | |
951 | rc = PTR_RET(ap_poll_kthread); | |
952 | if (rc) | |
953 | ap_poll_kthread = NULL; | |
954 | mutex_unlock(&ap_poll_thread_mutex); | |
955 | return rc; | |
956 | } | |
957 | ||
958 | static void ap_poll_thread_stop(void) | |
959 | { | |
960 | if (!ap_poll_kthread) | |
961 | return; | |
962 | mutex_lock(&ap_poll_thread_mutex); | |
963 | kthread_stop(ap_poll_kthread); | |
964 | ap_poll_kthread = NULL; | |
965 | mutex_unlock(&ap_poll_thread_mutex); | |
966 | } | |
967 | ||
3f3007af MS |
968 | /** |
969 | * ap_queue_message(): Queue a request to an AP device. | |
970 | * @ap_dev: The AP device to queue the message to | |
971 | * @ap_msg: The message that is to be added | |
972 | */ | |
973 | void ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
974 | { | |
975 | /* For asynchronous message handling a valid receive-callback | |
976 | * is required. */ | |
977 | BUG_ON(!ap_msg->receive); | |
978 | ||
979 | spin_lock_bh(&ap_dev->lock); | |
980 | /* Queue the message. */ | |
981 | list_add_tail(&ap_msg->list, &ap_dev->requestq); | |
982 | ap_dev->requestq_count++; | |
983 | ap_dev->total_request_count++; | |
984 | /* Send/receive as many request from the queue as possible. */ | |
985 | ap_sm_wait(ap_sm_event_loop(ap_dev, AP_EVENT_POLL)); | |
986 | spin_unlock_bh(&ap_dev->lock); | |
987 | } | |
988 | EXPORT_SYMBOL(ap_queue_message); | |
989 | ||
990 | /** | |
991 | * ap_cancel_message(): Cancel a crypto request. | |
992 | * @ap_dev: The AP device that has the message queued | |
993 | * @ap_msg: The message that is to be removed | |
994 | * | |
995 | * Cancel a crypto request. This is done by removing the request | |
996 | * from the device pending or request queue. Note that the | |
997 | * request stays on the AP queue. When it finishes the message | |
998 | * reply will be discarded because the psmid can't be found. | |
999 | */ | |
1000 | void ap_cancel_message(struct ap_device *ap_dev, struct ap_message *ap_msg) | |
1001 | { | |
1002 | struct ap_message *tmp; | |
1003 | ||
1004 | spin_lock_bh(&ap_dev->lock); | |
1005 | if (!list_empty(&ap_msg->list)) { | |
1006 | list_for_each_entry(tmp, &ap_dev->pendingq, list) | |
1007 | if (tmp->psmid == ap_msg->psmid) { | |
1008 | ap_dev->pendingq_count--; | |
1009 | goto found; | |
1010 | } | |
1011 | ap_dev->requestq_count--; | |
1012 | found: | |
1013 | list_del_init(&ap_msg->list); | |
1014 | } | |
1015 | spin_unlock_bh(&ap_dev->lock); | |
1016 | } | |
1017 | EXPORT_SYMBOL(ap_cancel_message); | |
1018 | ||
1749a81d | 1019 | /* |
1534c382 MS |
1020 | * AP device related attributes. |
1021 | */ | |
1022 | static ssize_t ap_hwtype_show(struct device *dev, | |
1023 | struct device_attribute *attr, char *buf) | |
1024 | { | |
1025 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1026 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->device_type); | |
1027 | } | |
1534c382 | 1028 | |
43c207e6 | 1029 | static DEVICE_ATTR(hwtype, 0444, ap_hwtype_show, NULL); |
42f4dd61 IT |
1030 | |
1031 | static ssize_t ap_raw_hwtype_show(struct device *dev, | |
1032 | struct device_attribute *attr, char *buf) | |
1033 | { | |
1034 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1035 | ||
1036 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->raw_hwtype); | |
1037 | } | |
1038 | ||
1039 | static DEVICE_ATTR(raw_hwtype, 0444, ap_raw_hwtype_show, NULL); | |
1040 | ||
1534c382 MS |
1041 | static ssize_t ap_depth_show(struct device *dev, struct device_attribute *attr, |
1042 | char *buf) | |
1043 | { | |
1044 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1045 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->queue_depth); | |
1046 | } | |
1534c382 | 1047 | |
43c207e6 | 1048 | static DEVICE_ATTR(depth, 0444, ap_depth_show, NULL); |
1534c382 MS |
1049 | static ssize_t ap_request_count_show(struct device *dev, |
1050 | struct device_attribute *attr, | |
1051 | char *buf) | |
1052 | { | |
1053 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1054 | int rc; | |
1055 | ||
1056 | spin_lock_bh(&ap_dev->lock); | |
1057 | rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->total_request_count); | |
1058 | spin_unlock_bh(&ap_dev->lock); | |
1059 | return rc; | |
1060 | } | |
1061 | ||
1062 | static DEVICE_ATTR(request_count, 0444, ap_request_count_show, NULL); | |
1063 | ||
b26bd941 HD |
1064 | static ssize_t ap_requestq_count_show(struct device *dev, |
1065 | struct device_attribute *attr, char *buf) | |
1066 | { | |
1067 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1068 | int rc; | |
1069 | ||
1070 | spin_lock_bh(&ap_dev->lock); | |
1071 | rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->requestq_count); | |
1072 | spin_unlock_bh(&ap_dev->lock); | |
1073 | return rc; | |
1074 | } | |
1075 | ||
1076 | static DEVICE_ATTR(requestq_count, 0444, ap_requestq_count_show, NULL); | |
1077 | ||
1078 | static ssize_t ap_pendingq_count_show(struct device *dev, | |
1079 | struct device_attribute *attr, char *buf) | |
1080 | { | |
1081 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1082 | int rc; | |
1083 | ||
1084 | spin_lock_bh(&ap_dev->lock); | |
1085 | rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->pendingq_count); | |
1086 | spin_unlock_bh(&ap_dev->lock); | |
1087 | return rc; | |
1088 | } | |
1089 | ||
1090 | static DEVICE_ATTR(pendingq_count, 0444, ap_pendingq_count_show, NULL); | |
1091 | ||
c50a160c IT |
1092 | static ssize_t ap_reset_show(struct device *dev, |
1093 | struct device_attribute *attr, char *buf) | |
1094 | { | |
1095 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1096 | int rc = 0; | |
1097 | ||
1098 | spin_lock_bh(&ap_dev->lock); | |
3f3007af MS |
1099 | switch (ap_dev->state) { |
1100 | case AP_STATE_RESET_START: | |
1101 | case AP_STATE_RESET_WAIT: | |
1102 | rc = snprintf(buf, PAGE_SIZE, "Reset in progress.\n"); | |
c50a160c | 1103 | break; |
3f3007af MS |
1104 | case AP_STATE_WORKING: |
1105 | case AP_STATE_QUEUE_FULL: | |
c50a160c IT |
1106 | rc = snprintf(buf, PAGE_SIZE, "Reset Timer armed.\n"); |
1107 | break; | |
c50a160c | 1108 | default: |
3f3007af | 1109 | rc = snprintf(buf, PAGE_SIZE, "No Reset Timer set.\n"); |
c50a160c IT |
1110 | } |
1111 | spin_unlock_bh(&ap_dev->lock); | |
1112 | return rc; | |
1113 | } | |
1114 | ||
1115 | static DEVICE_ATTR(reset, 0444, ap_reset_show, NULL); | |
1116 | ||
1117 | static ssize_t ap_interrupt_show(struct device *dev, | |
1118 | struct device_attribute *attr, char *buf) | |
1119 | { | |
1120 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1121 | int rc = 0; | |
1122 | ||
1123 | spin_lock_bh(&ap_dev->lock); | |
3f3007af | 1124 | if (ap_dev->state == AP_STATE_SETIRQ_WAIT) |
c50a160c | 1125 | rc = snprintf(buf, PAGE_SIZE, "Enable Interrupt pending.\n"); |
3f3007af MS |
1126 | else if (ap_dev->interrupt == AP_INTR_ENABLED) |
1127 | rc = snprintf(buf, PAGE_SIZE, "Interrupts enabled.\n"); | |
1128 | else | |
1129 | rc = snprintf(buf, PAGE_SIZE, "Interrupts disabled.\n"); | |
c50a160c IT |
1130 | spin_unlock_bh(&ap_dev->lock); |
1131 | return rc; | |
1132 | } | |
1133 | ||
1134 | static DEVICE_ATTR(interrupt, 0444, ap_interrupt_show, NULL); | |
1135 | ||
1534c382 MS |
1136 | static ssize_t ap_modalias_show(struct device *dev, |
1137 | struct device_attribute *attr, char *buf) | |
1138 | { | |
c50a160c | 1139 | return sprintf(buf, "ap:t%02X\n", to_ap_dev(dev)->device_type); |
1534c382 MS |
1140 | } |
1141 | ||
1142 | static DEVICE_ATTR(modalias, 0444, ap_modalias_show, NULL); | |
1143 | ||
b26bd941 HD |
1144 | static ssize_t ap_functions_show(struct device *dev, |
1145 | struct device_attribute *attr, char *buf) | |
1146 | { | |
1147 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1148 | return snprintf(buf, PAGE_SIZE, "0x%08X\n", ap_dev->functions); | |
1149 | } | |
1150 | ||
1151 | static DEVICE_ATTR(ap_functions, 0444, ap_functions_show, NULL); | |
1152 | ||
1534c382 MS |
1153 | static struct attribute *ap_dev_attrs[] = { |
1154 | &dev_attr_hwtype.attr, | |
42f4dd61 | 1155 | &dev_attr_raw_hwtype.attr, |
1534c382 MS |
1156 | &dev_attr_depth.attr, |
1157 | &dev_attr_request_count.attr, | |
b26bd941 HD |
1158 | &dev_attr_requestq_count.attr, |
1159 | &dev_attr_pendingq_count.attr, | |
c50a160c IT |
1160 | &dev_attr_reset.attr, |
1161 | &dev_attr_interrupt.attr, | |
1534c382 | 1162 | &dev_attr_modalias.attr, |
b26bd941 | 1163 | &dev_attr_ap_functions.attr, |
1534c382 MS |
1164 | NULL |
1165 | }; | |
1166 | static struct attribute_group ap_dev_attr_group = { | |
1167 | .attrs = ap_dev_attrs | |
1168 | }; | |
1169 | ||
1170 | /** | |
1749a81d FB |
1171 | * ap_bus_match() |
1172 | * @dev: Pointer to device | |
1173 | * @drv: Pointer to device_driver | |
1174 | * | |
1534c382 MS |
1175 | * AP bus driver registration/unregistration. |
1176 | */ | |
1177 | static int ap_bus_match(struct device *dev, struct device_driver *drv) | |
1178 | { | |
1179 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1180 | struct ap_driver *ap_drv = to_ap_drv(drv); | |
1181 | struct ap_device_id *id; | |
1182 | ||
1749a81d | 1183 | /* |
1534c382 MS |
1184 | * Compare device type of the device with the list of |
1185 | * supported types of the device_driver. | |
1186 | */ | |
1187 | for (id = ap_drv->ids; id->match_flags; id++) { | |
1188 | if ((id->match_flags & AP_DEVICE_ID_MATCH_DEVICE_TYPE) && | |
1189 | (id->dev_type != ap_dev->device_type)) | |
1190 | continue; | |
1191 | return 1; | |
1192 | } | |
1193 | return 0; | |
1194 | } | |
1195 | ||
1196 | /** | |
1749a81d FB |
1197 | * ap_uevent(): Uevent function for AP devices. |
1198 | * @dev: Pointer to device | |
1199 | * @env: Pointer to kobj_uevent_env | |
1200 | * | |
1201 | * It sets up a single environment variable DEV_TYPE which contains the | |
1202 | * hardware device type. | |
1534c382 | 1203 | */ |
7eff2e7a | 1204 | static int ap_uevent (struct device *dev, struct kobj_uevent_env *env) |
1534c382 MS |
1205 | { |
1206 | struct ap_device *ap_dev = to_ap_dev(dev); | |
7eff2e7a | 1207 | int retval = 0; |
1534c382 MS |
1208 | |
1209 | if (!ap_dev) | |
1210 | return -ENODEV; | |
1211 | ||
1212 | /* Set up DEV_TYPE environment variable. */ | |
7eff2e7a | 1213 | retval = add_uevent_var(env, "DEV_TYPE=%04X", ap_dev->device_type); |
bf62456e ER |
1214 | if (retval) |
1215 | return retval; | |
1216 | ||
66a4263b | 1217 | /* Add MODALIAS= */ |
7eff2e7a | 1218 | retval = add_uevent_var(env, "MODALIAS=ap:t%02X", ap_dev->device_type); |
bf62456e | 1219 | |
bf62456e | 1220 | return retval; |
1534c382 MS |
1221 | } |
1222 | ||
83e9d5d2 | 1223 | static int ap_dev_suspend(struct device *dev, pm_message_t state) |
772f5472 FB |
1224 | { |
1225 | struct ap_device *ap_dev = to_ap_dev(dev); | |
772f5472 | 1226 | |
772f5472 | 1227 | /* Poll on the device until all requests are finished. */ |
3f3007af MS |
1228 | spin_lock_bh(&ap_dev->lock); |
1229 | ap_dev->state = AP_STATE_SUSPEND_WAIT; | |
1230 | while (ap_sm_event(ap_dev, AP_EVENT_POLL) != AP_WAIT_NONE) | |
1231 | ; | |
1232 | ap_dev->state = AP_STATE_BORKED; | |
1233 | spin_unlock_bh(&ap_dev->lock); | |
83e9d5d2 MS |
1234 | return 0; |
1235 | } | |
5314af69 | 1236 | |
83e9d5d2 MS |
1237 | static int ap_dev_resume(struct device *dev) |
1238 | { | |
772f5472 FB |
1239 | return 0; |
1240 | } | |
1241 | ||
83e9d5d2 MS |
1242 | static void ap_bus_suspend(void) |
1243 | { | |
1244 | ap_suspend_flag = 1; | |
1245 | /* | |
1246 | * Disable scanning for devices, thus we do not want to scan | |
1247 | * for them after removing. | |
1248 | */ | |
8139b89d | 1249 | flush_work(&ap_scan_work); |
83e9d5d2 MS |
1250 | tasklet_disable(&ap_tasklet); |
1251 | } | |
1252 | ||
1253 | static int __ap_devices_unregister(struct device *dev, void *dummy) | |
1254 | { | |
1255 | device_unregister(dev); | |
1256 | return 0; | |
1257 | } | |
1258 | ||
1259 | static void ap_bus_resume(void) | |
772f5472 | 1260 | { |
f4eae94f | 1261 | int rc; |
772f5472 | 1262 | |
83e9d5d2 MS |
1263 | /* Unconditionally remove all AP devices */ |
1264 | bus_for_each_dev(&ap_bus_type, NULL, NULL, __ap_devices_unregister); | |
1265 | /* Reset thin interrupt setting */ | |
1266 | if (ap_interrupts_available() && !ap_using_interrupts()) { | |
1267 | rc = register_adapter_interrupt(&ap_airq); | |
1268 | ap_airq_flag = (rc == 0); | |
5314af69 | 1269 | } |
83e9d5d2 MS |
1270 | if (!ap_interrupts_available() && ap_using_interrupts()) { |
1271 | unregister_adapter_interrupt(&ap_airq); | |
1272 | ap_airq_flag = 0; | |
1273 | } | |
1274 | /* Reset domain */ | |
1275 | if (!user_set_domain) | |
1276 | ap_domain_index = -1; | |
1277 | /* Get things going again */ | |
1278 | ap_suspend_flag = 0; | |
1279 | if (ap_airq_flag) | |
1280 | xchg(ap_airq.lsi_ptr, 0); | |
1281 | tasklet_enable(&ap_tasklet); | |
8139b89d | 1282 | queue_work(system_long_wq, &ap_scan_work); |
83e9d5d2 | 1283 | } |
772f5472 | 1284 | |
83e9d5d2 MS |
1285 | static int ap_power_event(struct notifier_block *this, unsigned long event, |
1286 | void *ptr) | |
1287 | { | |
1288 | switch (event) { | |
1289 | case PM_HIBERNATION_PREPARE: | |
1290 | case PM_SUSPEND_PREPARE: | |
1291 | ap_bus_suspend(); | |
1292 | break; | |
1293 | case PM_POST_HIBERNATION: | |
1294 | case PM_POST_SUSPEND: | |
1295 | ap_bus_resume(); | |
1296 | break; | |
1297 | default: | |
1298 | break; | |
1299 | } | |
1300 | return NOTIFY_DONE; | |
772f5472 | 1301 | } |
83e9d5d2 MS |
1302 | static struct notifier_block ap_power_notifier = { |
1303 | .notifier_call = ap_power_event, | |
1304 | }; | |
772f5472 | 1305 | |
1534c382 MS |
1306 | static struct bus_type ap_bus_type = { |
1307 | .name = "ap", | |
1308 | .match = &ap_bus_match, | |
1309 | .uevent = &ap_uevent, | |
83e9d5d2 MS |
1310 | .suspend = ap_dev_suspend, |
1311 | .resume = ap_dev_resume, | |
1534c382 MS |
1312 | }; |
1313 | ||
1314 | static int ap_device_probe(struct device *dev) | |
1315 | { | |
1316 | struct ap_device *ap_dev = to_ap_dev(dev); | |
3f3007af MS |
1317 | struct ap_driver *ap_drv = to_ap_drv(dev->driver); |
1318 | int rc; | |
666e68e0 | 1319 | |
3f3007af | 1320 | ap_dev->drv = ap_drv; |
1534c382 | 1321 | rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV; |
3f3007af MS |
1322 | if (rc) |
1323 | ap_dev->drv = NULL; | |
1534c382 MS |
1324 | return rc; |
1325 | } | |
1326 | ||
1327 | /** | |
1749a81d FB |
1328 | * __ap_flush_queue(): Flush requests. |
1329 | * @ap_dev: Pointer to the AP device | |
1330 | * | |
1534c382 | 1331 | * Flush all requests from the request/pending queue of an AP device. |
1534c382 | 1332 | */ |
4d284cac | 1333 | static void __ap_flush_queue(struct ap_device *ap_dev) |
1534c382 MS |
1334 | { |
1335 | struct ap_message *ap_msg, *next; | |
1336 | ||
1337 | list_for_each_entry_safe(ap_msg, next, &ap_dev->pendingq, list) { | |
1338 | list_del_init(&ap_msg->list); | |
1339 | ap_dev->pendingq_count--; | |
f58fe336 MS |
1340 | ap_msg->rc = -EAGAIN; |
1341 | ap_msg->receive(ap_dev, ap_msg, NULL); | |
1534c382 MS |
1342 | } |
1343 | list_for_each_entry_safe(ap_msg, next, &ap_dev->requestq, list) { | |
1344 | list_del_init(&ap_msg->list); | |
1345 | ap_dev->requestq_count--; | |
f58fe336 MS |
1346 | ap_msg->rc = -EAGAIN; |
1347 | ap_msg->receive(ap_dev, ap_msg, NULL); | |
1534c382 MS |
1348 | } |
1349 | } | |
1350 | ||
1351 | void ap_flush_queue(struct ap_device *ap_dev) | |
1352 | { | |
1353 | spin_lock_bh(&ap_dev->lock); | |
1354 | __ap_flush_queue(ap_dev); | |
1355 | spin_unlock_bh(&ap_dev->lock); | |
1356 | } | |
1357 | EXPORT_SYMBOL(ap_flush_queue); | |
1358 | ||
1359 | static int ap_device_remove(struct device *dev) | |
1360 | { | |
1361 | struct ap_device *ap_dev = to_ap_dev(dev); | |
1362 | struct ap_driver *ap_drv = ap_dev->drv; | |
1363 | ||
4e56296d | 1364 | ap_flush_queue(ap_dev); |
af512ed0 | 1365 | del_timer_sync(&ap_dev->timeout); |
43c207e6 | 1366 | spin_lock_bh(&ap_device_list_lock); |
cf352ce0 | 1367 | list_del_init(&ap_dev->list); |
43c207e6 | 1368 | spin_unlock_bh(&ap_device_list_lock); |
faa582ca RW |
1369 | if (ap_drv->remove) |
1370 | ap_drv->remove(ap_dev); | |
e675c0d2 RW |
1371 | spin_lock_bh(&ap_dev->lock); |
1372 | atomic_sub(ap_dev->queue_count, &ap_poll_requests); | |
1373 | spin_unlock_bh(&ap_dev->lock); | |
1534c382 MS |
1374 | return 0; |
1375 | } | |
1376 | ||
3f3007af MS |
1377 | static void ap_device_release(struct device *dev) |
1378 | { | |
1379 | kfree(to_ap_dev(dev)); | |
1380 | } | |
1381 | ||
1534c382 MS |
1382 | int ap_driver_register(struct ap_driver *ap_drv, struct module *owner, |
1383 | char *name) | |
1384 | { | |
1385 | struct device_driver *drv = &ap_drv->driver; | |
1386 | ||
1387 | drv->bus = &ap_bus_type; | |
1388 | drv->probe = ap_device_probe; | |
1389 | drv->remove = ap_device_remove; | |
1390 | drv->owner = owner; | |
1391 | drv->name = name; | |
1392 | return driver_register(drv); | |
1393 | } | |
1394 | EXPORT_SYMBOL(ap_driver_register); | |
1395 | ||
1396 | void ap_driver_unregister(struct ap_driver *ap_drv) | |
1397 | { | |
1398 | driver_unregister(&ap_drv->driver); | |
1399 | } | |
1400 | EXPORT_SYMBOL(ap_driver_unregister); | |
1401 | ||
dabecb29 HD |
1402 | void ap_bus_force_rescan(void) |
1403 | { | |
83e9d5d2 MS |
1404 | if (ap_suspend_flag) |
1405 | return; | |
56bbe686 | 1406 | /* processing a asynchronous bus rescan */ |
fcd0d1f6 | 1407 | del_timer(&ap_config_timer); |
8139b89d MS |
1408 | queue_work(system_long_wq, &ap_scan_work); |
1409 | flush_work(&ap_scan_work); | |
dabecb29 HD |
1410 | } |
1411 | EXPORT_SYMBOL(ap_bus_force_rescan); | |
1412 | ||
1749a81d | 1413 | /* |
1534c382 MS |
1414 | * AP bus attributes. |
1415 | */ | |
1416 | static ssize_t ap_domain_show(struct bus_type *bus, char *buf) | |
1417 | { | |
1418 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index); | |
1419 | } | |
1420 | ||
1421 | static BUS_ATTR(ap_domain, 0444, ap_domain_show, NULL); | |
1422 | ||
91f3e3ea IT |
1423 | static ssize_t ap_control_domain_mask_show(struct bus_type *bus, char *buf) |
1424 | { | |
889875a1 MS |
1425 | if (!ap_configuration) /* QCI not supported */ |
1426 | return snprintf(buf, PAGE_SIZE, "not supported\n"); | |
1427 | if (!test_facility(76)) | |
1428 | /* format 0 - 16 bit domain field */ | |
1429 | return snprintf(buf, PAGE_SIZE, "%08x%08x\n", | |
1430 | ap_configuration->adm[0], | |
1431 | ap_configuration->adm[1]); | |
1432 | /* format 1 - 256 bit domain field */ | |
1433 | return snprintf(buf, PAGE_SIZE, | |
1434 | "0x%08x%08x%08x%08x%08x%08x%08x%08x\n", | |
91f3e3ea IT |
1435 | ap_configuration->adm[0], ap_configuration->adm[1], |
1436 | ap_configuration->adm[2], ap_configuration->adm[3], | |
1437 | ap_configuration->adm[4], ap_configuration->adm[5], | |
1438 | ap_configuration->adm[6], ap_configuration->adm[7]); | |
91f3e3ea IT |
1439 | } |
1440 | ||
1441 | static BUS_ATTR(ap_control_domain_mask, 0444, | |
1442 | ap_control_domain_mask_show, NULL); | |
1443 | ||
1534c382 MS |
1444 | static ssize_t ap_config_time_show(struct bus_type *bus, char *buf) |
1445 | { | |
1446 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_config_time); | |
1447 | } | |
1448 | ||
cb17a636 FB |
1449 | static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf) |
1450 | { | |
1451 | return snprintf(buf, PAGE_SIZE, "%d\n", | |
1452 | ap_using_interrupts() ? 1 : 0); | |
1453 | } | |
1454 | ||
1455 | static BUS_ATTR(ap_interrupts, 0444, ap_interrupts_show, NULL); | |
1456 | ||
1534c382 MS |
1457 | static ssize_t ap_config_time_store(struct bus_type *bus, |
1458 | const char *buf, size_t count) | |
1459 | { | |
1460 | int time; | |
1461 | ||
1462 | if (sscanf(buf, "%d\n", &time) != 1 || time < 5 || time > 120) | |
1463 | return -EINVAL; | |
1464 | ap_config_time = time; | |
fcd0d1f6 | 1465 | mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ); |
1534c382 MS |
1466 | return count; |
1467 | } | |
1468 | ||
1469 | static BUS_ATTR(config_time, 0644, ap_config_time_show, ap_config_time_store); | |
1470 | ||
1471 | static ssize_t ap_poll_thread_show(struct bus_type *bus, char *buf) | |
1472 | { | |
1473 | return snprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0); | |
1474 | } | |
1475 | ||
1476 | static ssize_t ap_poll_thread_store(struct bus_type *bus, | |
1477 | const char *buf, size_t count) | |
1478 | { | |
1479 | int flag, rc; | |
1480 | ||
1481 | if (sscanf(buf, "%d\n", &flag) != 1) | |
1482 | return -EINVAL; | |
1483 | if (flag) { | |
1484 | rc = ap_poll_thread_start(); | |
1485 | if (rc) | |
83e9d5d2 MS |
1486 | count = rc; |
1487 | } else | |
1534c382 MS |
1488 | ap_poll_thread_stop(); |
1489 | return count; | |
1490 | } | |
1491 | ||
1492 | static BUS_ATTR(poll_thread, 0644, ap_poll_thread_show, ap_poll_thread_store); | |
1493 | ||
fe137230 FB |
1494 | static ssize_t poll_timeout_show(struct bus_type *bus, char *buf) |
1495 | { | |
1496 | return snprintf(buf, PAGE_SIZE, "%llu\n", poll_timeout); | |
1497 | } | |
1498 | ||
1499 | static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf, | |
1500 | size_t count) | |
1501 | { | |
1502 | unsigned long long time; | |
1503 | ktime_t hr_time; | |
1504 | ||
1505 | /* 120 seconds = maximum poll interval */ | |
cb17a636 FB |
1506 | if (sscanf(buf, "%llu\n", &time) != 1 || time < 1 || |
1507 | time > 120000000000ULL) | |
fe137230 FB |
1508 | return -EINVAL; |
1509 | poll_timeout = time; | |
1510 | hr_time = ktime_set(0, poll_timeout); | |
1511 | ||
8cc2af7c IT |
1512 | spin_lock_bh(&ap_poll_timer_lock); |
1513 | hrtimer_cancel(&ap_poll_timer); | |
1514 | hrtimer_set_expires(&ap_poll_timer, hr_time); | |
1515 | hrtimer_start_expires(&ap_poll_timer, HRTIMER_MODE_ABS); | |
1516 | spin_unlock_bh(&ap_poll_timer_lock); | |
1517 | ||
fe137230 FB |
1518 | return count; |
1519 | } | |
1520 | ||
1521 | static BUS_ATTR(poll_timeout, 0644, poll_timeout_show, poll_timeout_store); | |
1522 | ||
5bc334bf IT |
1523 | static ssize_t ap_max_domain_id_show(struct bus_type *bus, char *buf) |
1524 | { | |
889875a1 MS |
1525 | int max_domain_id; |
1526 | ||
1527 | if (ap_configuration) | |
1528 | max_domain_id = ap_max_domain_id ? : -1; | |
1529 | else | |
5bc334bf | 1530 | max_domain_id = 15; |
5bc334bf IT |
1531 | return snprintf(buf, PAGE_SIZE, "%d\n", max_domain_id); |
1532 | } | |
1533 | ||
1534 | static BUS_ATTR(ap_max_domain_id, 0444, ap_max_domain_id_show, NULL); | |
1535 | ||
1534c382 MS |
1536 | static struct bus_attribute *const ap_bus_attrs[] = { |
1537 | &bus_attr_ap_domain, | |
91f3e3ea | 1538 | &bus_attr_ap_control_domain_mask, |
1534c382 MS |
1539 | &bus_attr_config_time, |
1540 | &bus_attr_poll_thread, | |
cb17a636 | 1541 | &bus_attr_ap_interrupts, |
fe137230 | 1542 | &bus_attr_poll_timeout, |
5bc334bf | 1543 | &bus_attr_ap_max_domain_id, |
fe137230 | 1544 | NULL, |
1534c382 MS |
1545 | }; |
1546 | ||
1547 | /** | |
1749a81d FB |
1548 | * ap_select_domain(): Select an AP domain. |
1549 | * | |
1550 | * Pick one of the 16 AP domains. | |
1534c382 | 1551 | */ |
4d284cac | 1552 | static int ap_select_domain(void) |
1534c382 | 1553 | { |
6acbe21f MS |
1554 | int count, max_count, best_domain; |
1555 | struct ap_queue_status status; | |
1556 | int i, j; | |
1534c382 | 1557 | |
1749a81d | 1558 | /* |
1534c382 MS |
1559 | * We want to use a single domain. Either the one specified with |
1560 | * the "domain=" parameter or the domain with the maximum number | |
1561 | * of devices. | |
1562 | */ | |
889875a1 | 1563 | if (ap_domain_index >= 0) |
1534c382 MS |
1564 | /* Domain has already been selected. */ |
1565 | return 0; | |
1566 | best_domain = -1; | |
1567 | max_count = 0; | |
1568 | for (i = 0; i < AP_DOMAINS; i++) { | |
75014550 HD |
1569 | if (!ap_test_config_domain(i)) |
1570 | continue; | |
1534c382 MS |
1571 | count = 0; |
1572 | for (j = 0; j < AP_DEVICES; j++) { | |
75014550 HD |
1573 | if (!ap_test_config_card_id(j)) |
1574 | continue; | |
6acbe21f MS |
1575 | status = ap_test_queue(AP_MKQID(j, i), NULL); |
1576 | if (status.response_code != AP_RESPONSE_NORMAL) | |
1534c382 MS |
1577 | continue; |
1578 | count++; | |
1579 | } | |
1580 | if (count > max_count) { | |
1581 | max_count = count; | |
1582 | best_domain = i; | |
1583 | } | |
1584 | } | |
1585 | if (best_domain >= 0){ | |
1586 | ap_domain_index = best_domain; | |
1587 | return 0; | |
1588 | } | |
1589 | return -ENODEV; | |
1590 | } | |
1591 | ||
1534c382 | 1592 | /** |
1749a81d FB |
1593 | * __ap_scan_bus(): Scan the AP bus. |
1594 | * @dev: Pointer to device | |
1595 | * @data: Pointer to data | |
1596 | * | |
1597 | * Scan the AP bus for new devices. | |
1534c382 MS |
1598 | */ |
1599 | static int __ap_scan_bus(struct device *dev, void *data) | |
1600 | { | |
1601 | return to_ap_dev(dev)->qid == (ap_qid_t)(unsigned long) data; | |
1602 | } | |
1603 | ||
4927b3f7 | 1604 | static void ap_scan_bus(struct work_struct *unused) |
1534c382 MS |
1605 | { |
1606 | struct ap_device *ap_dev; | |
1607 | struct device *dev; | |
1608 | ap_qid_t qid; | |
c50a160c | 1609 | int queue_depth = 0, device_type = 0; |
3f3007af MS |
1610 | unsigned int device_functions = 0; |
1611 | int rc, i, borked; | |
1534c382 | 1612 | |
75014550 | 1613 | ap_query_configuration(); |
83e9d5d2 | 1614 | if (ap_select_domain() != 0) |
fcd0d1f6 | 1615 | goto out; |
889875a1 | 1616 | |
1534c382 MS |
1617 | for (i = 0; i < AP_DEVICES; i++) { |
1618 | qid = AP_MKQID(i, ap_domain_index); | |
1619 | dev = bus_find_device(&ap_bus_type, NULL, | |
1620 | (void *)(unsigned long)qid, | |
1621 | __ap_scan_bus); | |
889875a1 MS |
1622 | rc = ap_query_queue(qid, &queue_depth, &device_type, |
1623 | &device_functions); | |
c6a48264 RW |
1624 | if (dev) { |
1625 | ap_dev = to_ap_dev(dev); | |
1626 | spin_lock_bh(&ap_dev->lock); | |
3f3007af MS |
1627 | if (rc == -ENODEV) |
1628 | ap_dev->state = AP_STATE_BORKED; | |
1629 | borked = ap_dev->state == AP_STATE_BORKED; | |
af512ed0 | 1630 | spin_unlock_bh(&ap_dev->lock); |
3f3007af MS |
1631 | if (borked) /* Remove broken device */ |
1632 | device_unregister(dev); | |
1534c382 | 1633 | put_device(dev); |
3f3007af MS |
1634 | if (!borked) |
1635 | continue; | |
1534c382 | 1636 | } |
1534c382 MS |
1637 | if (rc) |
1638 | continue; | |
1639 | ap_dev = kzalloc(sizeof(*ap_dev), GFP_KERNEL); | |
1640 | if (!ap_dev) | |
1641 | break; | |
1642 | ap_dev->qid = qid; | |
3f3007af MS |
1643 | ap_dev->state = AP_STATE_RESET_START; |
1644 | ap_dev->interrupt = AP_INTR_DISABLED; | |
1534c382 | 1645 | ap_dev->queue_depth = queue_depth; |
6acbe21f MS |
1646 | ap_dev->raw_hwtype = device_type; |
1647 | ap_dev->device_type = device_type; | |
1648 | ap_dev->functions = device_functions; | |
1534c382 MS |
1649 | spin_lock_init(&ap_dev->lock); |
1650 | INIT_LIST_HEAD(&ap_dev->pendingq); | |
1651 | INIT_LIST_HEAD(&ap_dev->requestq); | |
cf352ce0 | 1652 | INIT_LIST_HEAD(&ap_dev->list); |
af512ed0 RW |
1653 | setup_timer(&ap_dev->timeout, ap_request_timeout, |
1654 | (unsigned long) ap_dev); | |
1e2076f4 | 1655 | |
1534c382 MS |
1656 | ap_dev->device.bus = &ap_bus_type; |
1657 | ap_dev->device.parent = ap_root_device; | |
3f3007af MS |
1658 | rc = dev_set_name(&ap_dev->device, "card%02x", |
1659 | AP_QID_DEVICE(ap_dev->qid)); | |
1660 | if (rc) { | |
edc44fa0 FB |
1661 | kfree(ap_dev); |
1662 | continue; | |
1663 | } | |
3f3007af MS |
1664 | /* Add to list of devices */ |
1665 | spin_lock_bh(&ap_device_list_lock); | |
1666 | list_add(&ap_dev->list, &ap_device_list); | |
1667 | spin_unlock_bh(&ap_device_list_lock); | |
1668 | /* Start with a device reset */ | |
1669 | spin_lock_bh(&ap_dev->lock); | |
1670 | ap_sm_wait(ap_sm_event(ap_dev, AP_EVENT_POLL)); | |
1671 | spin_unlock_bh(&ap_dev->lock); | |
1672 | /* Register device */ | |
1534c382 MS |
1673 | ap_dev->device.release = ap_device_release; |
1674 | rc = device_register(&ap_dev->device); | |
1675 | if (rc) { | |
3f3007af MS |
1676 | spin_lock_bh(&ap_dev->lock); |
1677 | list_del_init(&ap_dev->list); | |
1678 | spin_unlock_bh(&ap_dev->lock); | |
c6304933 | 1679 | put_device(&ap_dev->device); |
1534c382 MS |
1680 | continue; |
1681 | } | |
1682 | /* Add device attributes. */ | |
1683 | rc = sysfs_create_group(&ap_dev->device.kobj, | |
1684 | &ap_dev_attr_group); | |
3f3007af | 1685 | if (rc) { |
1534c382 | 1686 | device_unregister(&ap_dev->device); |
3f3007af MS |
1687 | continue; |
1688 | } | |
1534c382 | 1689 | } |
fcd0d1f6 MS |
1690 | out: |
1691 | mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ); | |
1534c382 MS |
1692 | } |
1693 | ||
83e9d5d2 | 1694 | static void ap_config_timeout(unsigned long ptr) |
1534c382 | 1695 | { |
83e9d5d2 MS |
1696 | if (ap_suspend_flag) |
1697 | return; | |
8139b89d | 1698 | queue_work(system_long_wq, &ap_scan_work); |
1534c382 MS |
1699 | } |
1700 | ||
13e742ba RW |
1701 | static void ap_reset_domain(void) |
1702 | { | |
1703 | int i; | |
1704 | ||
889875a1 MS |
1705 | if (ap_domain_index == -1 || !ap_test_config_domain(ap_domain_index)) |
1706 | return; | |
1707 | for (i = 0; i < AP_DEVICES; i++) | |
1708 | ap_reset_queue(AP_MKQID(i, ap_domain_index)); | |
13e742ba RW |
1709 | } |
1710 | ||
1711 | static void ap_reset_all(void) | |
85eca850 RW |
1712 | { |
1713 | int i, j; | |
1714 | ||
170387a8 IT |
1715 | for (i = 0; i < AP_DOMAINS; i++) { |
1716 | if (!ap_test_config_domain(i)) | |
1717 | continue; | |
1718 | for (j = 0; j < AP_DEVICES; j++) { | |
1719 | if (!ap_test_config_card_id(j)) | |
1720 | continue; | |
85eca850 | 1721 | ap_reset_queue(AP_MKQID(j, i)); |
170387a8 IT |
1722 | } |
1723 | } | |
85eca850 RW |
1724 | } |
1725 | ||
1726 | static struct reset_call ap_reset_call = { | |
13e742ba | 1727 | .fn = ap_reset_all, |
85eca850 RW |
1728 | }; |
1729 | ||
1534c382 | 1730 | /** |
1749a81d FB |
1731 | * ap_module_init(): The module initialization code. |
1732 | * | |
1733 | * Initializes the module. | |
1534c382 MS |
1734 | */ |
1735 | int __init ap_module_init(void) | |
1736 | { | |
889875a1 | 1737 | int max_domain_id; |
1534c382 MS |
1738 | int rc, i; |
1739 | ||
889875a1 MS |
1740 | if (ap_instructions_available() != 0) { |
1741 | pr_warn("The hardware system does not support AP instructions\n"); | |
1742 | return -ENODEV; | |
1743 | } | |
1744 | ||
1745 | /* Get AP configuration data if available */ | |
1746 | ap_init_configuration(); | |
1747 | ||
1748 | if (ap_configuration) | |
1749 | max_domain_id = ap_max_domain_id ? : (AP_DOMAINS - 1); | |
1750 | else | |
1751 | max_domain_id = 15; | |
1752 | if (ap_domain_index < -1 || ap_domain_index > max_domain_id) { | |
1753 | pr_warn("%d is not a valid cryptographic domain\n", | |
1754 | ap_domain_index); | |
1534c382 MS |
1755 | return -EINVAL; |
1756 | } | |
5314af69 FB |
1757 | /* In resume callback we need to know if the user had set the domain. |
1758 | * If so, we can not just reset it. | |
1759 | */ | |
1760 | if (ap_domain_index >= 0) | |
1761 | user_set_domain = 1; | |
1762 | ||
cb17a636 | 1763 | if (ap_interrupts_available()) { |
f4eae94f MS |
1764 | rc = register_adapter_interrupt(&ap_airq); |
1765 | ap_airq_flag = (rc == 0); | |
cb17a636 FB |
1766 | } |
1767 | ||
85eca850 | 1768 | register_reset_call(&ap_reset_call); |
1534c382 MS |
1769 | |
1770 | /* Create /sys/bus/ap. */ | |
1771 | rc = bus_register(&ap_bus_type); | |
1772 | if (rc) | |
1773 | goto out; | |
1774 | for (i = 0; ap_bus_attrs[i]; i++) { | |
1775 | rc = bus_create_file(&ap_bus_type, ap_bus_attrs[i]); | |
1776 | if (rc) | |
1777 | goto out_bus; | |
1778 | } | |
1779 | ||
1780 | /* Create /sys/devices/ap. */ | |
035da16f | 1781 | ap_root_device = root_device_register("ap"); |
ba8da213 | 1782 | rc = PTR_RET(ap_root_device); |
1534c382 MS |
1783 | if (rc) |
1784 | goto out_bus; | |
1785 | ||
1749a81d | 1786 | /* Setup the AP bus rescan timer. */ |
fcd0d1f6 | 1787 | setup_timer(&ap_config_timer, ap_config_timeout, 0); |
1534c382 | 1788 | |
3f3007af MS |
1789 | /* |
1790 | * Setup the high resultion poll timer. | |
fe137230 FB |
1791 | * If we are running under z/VM adjust polling to z/VM polling rate. |
1792 | */ | |
1793 | if (MACHINE_IS_VM) | |
1794 | poll_timeout = 1500000; | |
93521314 | 1795 | spin_lock_init(&ap_poll_timer_lock); |
fe137230 FB |
1796 | hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); |
1797 | ap_poll_timer.function = ap_poll_timeout; | |
1798 | ||
1534c382 MS |
1799 | /* Start the low priority AP bus poll thread. */ |
1800 | if (ap_thread_flag) { | |
1801 | rc = ap_poll_thread_start(); | |
1802 | if (rc) | |
1803 | goto out_work; | |
1804 | } | |
1805 | ||
83e9d5d2 MS |
1806 | rc = register_pm_notifier(&ap_power_notifier); |
1807 | if (rc) | |
1808 | goto out_pm; | |
1809 | ||
8139b89d | 1810 | queue_work(system_long_wq, &ap_scan_work); |
3f3007af | 1811 | |
1534c382 MS |
1812 | return 0; |
1813 | ||
83e9d5d2 MS |
1814 | out_pm: |
1815 | ap_poll_thread_stop(); | |
1534c382 | 1816 | out_work: |
fe137230 | 1817 | hrtimer_cancel(&ap_poll_timer); |
035da16f | 1818 | root_device_unregister(ap_root_device); |
1534c382 MS |
1819 | out_bus: |
1820 | while (i--) | |
1821 | bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); | |
1822 | bus_unregister(&ap_bus_type); | |
1823 | out: | |
85eca850 | 1824 | unregister_reset_call(&ap_reset_call); |
f4eae94f MS |
1825 | if (ap_using_interrupts()) |
1826 | unregister_adapter_interrupt(&ap_airq); | |
889875a1 | 1827 | kfree(ap_configuration); |
1534c382 MS |
1828 | return rc; |
1829 | } | |
1830 | ||
1534c382 | 1831 | /** |
1749a81d FB |
1832 | * ap_modules_exit(): The module termination code |
1833 | * | |
1834 | * Terminates the module. | |
1534c382 MS |
1835 | */ |
1836 | void ap_module_exit(void) | |
1837 | { | |
1838 | int i; | |
1534c382 | 1839 | |
13e742ba | 1840 | ap_reset_domain(); |
1534c382 MS |
1841 | ap_poll_thread_stop(); |
1842 | del_timer_sync(&ap_config_timer); | |
fe137230 | 1843 | hrtimer_cancel(&ap_poll_timer); |
13e742ba | 1844 | tasklet_kill(&ap_tasklet); |
83e9d5d2 | 1845 | bus_for_each_dev(&ap_bus_type, NULL, NULL, __ap_devices_unregister); |
1534c382 MS |
1846 | for (i = 0; ap_bus_attrs[i]; i++) |
1847 | bus_remove_file(&ap_bus_type, ap_bus_attrs[i]); | |
83e9d5d2 | 1848 | unregister_pm_notifier(&ap_power_notifier); |
f60b8d44 | 1849 | root_device_unregister(ap_root_device); |
1534c382 | 1850 | bus_unregister(&ap_bus_type); |
889875a1 | 1851 | kfree(ap_configuration); |
85eca850 | 1852 | unregister_reset_call(&ap_reset_call); |
f4eae94f MS |
1853 | if (ap_using_interrupts()) |
1854 | unregister_adapter_interrupt(&ap_airq); | |
1534c382 MS |
1855 | } |
1856 | ||
1534c382 MS |
1857 | module_init(ap_module_init); |
1858 | module_exit(ap_module_exit); |